Question: The maximum depth of sedimentation tanks is limited to________________?

• 1. 2 m
• 2. 3 m
• 3. 4 m
• 4. 6 m

Question: Corrosion of well pipes may not be reduced by_________________?

• 1. reducing the draw down and the pumping rate
• 2. reducing the flow velocity
• 3. using thicker pipes
• 4. using screens having larger area of openings

Question: Acidity in water is caused due to_______________?

• 1. Mineral acids
• 2. Free CO2
• 3. Iron sulphate
• 4. All the above

Question: In slow sland filters, the turbidity of raw water can be removed only up to_________________?

• 1. 60 mg/litre
• 2. 75 mg/litre
• 3. 100 gm/litre
• 4. 150 mg/litre

Question: Time of concentration________________?

• 1. is the time taken, for precipitation
• 2. duration of rainfall.
• 3. time taken for all the ran off to reach the drain
• 4. time taken for the storm water to travel from the most remote point to the drain

Question: The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is________________?

• 1. 2 m
• 2. 2.25 m
• 3. 2.50 m
• 4. 3.00 m

Question: Disinfection of drinking water, is done to remove_________________?

• 1. odour
• 2. bacterias
• 3. turbidity
• 4. colour

Question: Aeration of water is done to remove______________?

• 1. odour
• 2. colour
• 3. bacterias
• 4. hardness

Question: If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is______________________?

• 1. 1880 kilo litres
• 2. 2880 kilo litres
• 3. 3880 kilo litres
• 4. 4880 kilo litres

Question: As per IS : 1172-1963, water required per head per day for average domestic purposes, is_______________?

• 1. 50 litres
• 2. 65 litres
• 3. 85 litres
• 4. 135 litres